While the mSATA can't be natively plugged into a SATA port, we have a interposer card that converts the mSATA interface to the standard seven-pin SATA connector. This does not create any sort of bottleneck, as mSATA still utilizes native SATA signaling.

Update: If you have been paying attention to the news, you already know about the SATA degradation problem in the H67 and P67 chipsets. We want to remind everyone that the problem only affects the 3 Gb/s ports. We're only testing on the 6 Gb/s ports here, so our results are unaffected.